Triangular display case



FIG. 1 is a front perspective view of a triangular display case showing my new design;

FIG. 2 is a right side elevational view thereof, the left side being a mirror image;

FIG. 3 is a front elevational view thereof; and

FIG. 4 is an enlarged vertical cross-sectional view thereof, taken in the direction of line 4--4 or FIG. 3. 

The ornamental design for a triangular display case, as shown and described. 